Table 4. Correlation between T staging and upstaging rates.

T Stage	N (%)	N0 to N1 (%)	N0 to N2 (%)	N1 to N2 (%)
Preoperative T stage
T1	1,843 (76.1)	101 (5.5)	94 (5.1)	11 (0.6)
T2	536 (22.1)	41 (7.6); P=0.065	34 (6.3); P=0.263	3 (0.5); P=0.921
T3	43 (1.8)	3 (6.9); P=0.672	4 (9.3); P=0.228	0
Pathologic T stage
T1	1,514 (62.5)	77 (5.1)	53 (40.1)	6 (0.4)
T2	790 (32.6)	55 (6.9); P=0.07	64 (48.5); P<0.0001	6 (0.7); P=0.259
T3	105 (4.3)	13 (12.4); P=0.002	13 (9.8); P<0.0001	1 (0.9); P=0.416
T4	14 (0.6)	1 (7.1); P=0.729	2 (14.3); P=0.05	1 (7.1); P=0.08